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Old 04-16-2012, 05:58 PM   #1
kavic5150
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Post ESC hit low voltage cutoff twice. Bad balance plug connection.

Edit: problem solved. One of the pins on the balance plug was not making a good connection.

Yesterday I had just taken off and the stock YGE 60 hit its LVC. Oops grabbed the wrong lipo, it wasnt charged. No problem just happened to be hovering 4 feet off the deck doing slow piros and plopped it down in the grass.

Today I flew with a verified fully charged pack, and 45 seconds into the flight the ESC cutoff and made a few beeps that I couldnt count because of traffic noise. I'm guessing LVC but I'm really not sure. Lowered the throttle to zero and I heard the ESC rearm itself.

I used the Progcard ii to turn off the LVC protection. Flew again with the other fully charged pack with no issues.

I would really rather over discharge or puff a pack a bit than trash those nice CF blades and whatever else.

Did I have my LVC cutoff set too high? I think it was at 3.1v. And that doesnt explain why it cut off with a full pack. My idle up curve is set a bit low from 60 to 80% throttle btw.

Anyone have some advice?
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Last edited by kavic5150; 04-21-2012 at 06:57 PM..
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Old 04-16-2012, 10:27 PM   #2
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Could be a weak lipo that doesn't hold its voltage too well on hard collective maneuvers. When you fly a weak lipo use low rpms and be easy on the sticks. Turning off LVC is also good in this case. Just don't forget to reset and start your timer.
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Old 04-17-2012, 09:47 AM   #3
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Bad solder joint?

Check the battery connectors and the ESC connectors.

Also make sure all cables are fully plugged on the receiver and on the motor.
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Old 04-17-2012, 10:36 AM   #4
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Are you running governor store mode? Regular governor? BEC? What size/type packs? What servos? Just curious because thats what was happening to friends and a BEC solved issues. You shouldnt have to run one and i know many dont but it fixed friends and still have the lvc protection.


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Old 04-17-2012, 12:00 PM   #5
kavic5150
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No governor, no bec. Only 2 packs, a nanotech 2650 35c 6s and a blue lipo 6s 40c 2650. I'm under 20 flights on both packs. Servos are hitec hs5245 on cyclic and inolab d261hb on tail.
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Old 04-17-2012, 12:52 PM   #6
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Just found the problem I think. On the blue lipo I have a bad cell. One of the cells on the edge will not charge past 3.8v and its been on the charger all morning.

Edit: Rubber bands were not to blame. I had a pin not making a connection in the lipo balance plug. I think I will use velcro from now on anyways.
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Last edited by kavic5150; 04-21-2012 at 06:55 PM.. Reason: problem solved
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Old 04-17-2012, 02:59 PM   #7
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Quote:
Originally Posted by kavic5150 View Post
Just found the problem I think. On the blue lipo I have a bad cell. One of the cells on the edge will not charge past 3.8v and its been on the charger all morning.

I suspect those rubber bands are to blame. Time to stop using them and change to a velcro strap.
I have 4 Blue Lipo 2650 20C with 98 flights on each. They are actually still good but only for light sport flying. No bad cells yet. Same for my 4 Flightmax packs 2650 20C. Each with over 100 flights but no bad cells. They are all weak but still usable for light sport flying. I use the rubber o-rings.
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Old 04-17-2012, 05:18 PM   #8
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Yaay. I fixed it.
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Last edited by kavic5150; 04-21-2012 at 06:57 PM.. Reason: derp
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